Tutorials: SIP Trunk Setup w/ IP Authentication (V16)

Required Access: FreePBX

Last Updated: 7/14/2025

Enter your credentials.

Select the "Connectivity" tab, then click on "Trunks" from the drop-down menu.

Click on the "+ Add Trunk" drop-down menu, then choose the "+ Add SIP (chan_pjsip) Trunk" option.

Enter the following under the General Settings tab:

• Trunk Name: Enter Voxtelesys as your SIP Trunk's name.
• Outbound CallerID: Enter the DID Number you received from Voxtelesys.
• Maximum Channels: Enter the Line limit set by Voxtelesys.

Switch over to the "Dialed Number Manipulation Rules" tab.

Add the rules below:

North American dialing rule w/ prepend:

• Prepend: 1
• Match Pattern: NXXNXXXXXX

North American dialing rule:

• Match Pattern: 1NXXNXXXXXX

911 rule:

• Match Pattern: 911

922 rule (Test dial of 911):

• Match Pattern: 922

988 rule:

• Match Pattern: 988

International dialing rule:

• Match Pattern: 011.

Switch over to the "pjsip Settings" tab.

Enter the following:

• Authentication: Set authentication to "None" to enable IP authentication.
• SIP Server: Enter the IP address you received from Voxtelesys.

Switch over to the "Codecs" sub-section.

Set the following codecs in this order:

• ulaw
• alaw
• g729

Click on "Submit" when you are finished.

After that, select "Apply Config" to reload FreePBX and finalize your changes.